The Rôle of Solvent Participation in Electrophilic Aromatic Substitution: Rates of a diazo coupling reaction in water and in aprotic polar solvents. 24th Communication on diazo coupling reactions

Palladium nanoparticles were efficiently prepared in situ by sodium cyanoborohydride reduction of Pd(ii) at room temperature using calcium-cholate hydrogel fibers as templates. The PdNPs self-organize on the gel fibers, which supports the controlled growth as well as stabilization of PdNPs. The hybrid xerogel was used as an efficient catalyst for the Suzuki coupling reaction in water.

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Synthesis of Azo Polyurethane-Urea and Investigation of its Thermo-Optic Properties

Zeitschrift für Physikalische Chemie ◽

10.1515/zpch-2015-0581 ◽

2016 ◽

Vol 230 (2) ◽

Cited By ~ 2

Author(s):

Caihong Chen ◽

Zhening Yang ◽

Fengxian Qiu ◽

Tianlin Cao ◽

Guorong Cao ◽

...

Keyword(s):

Coupling Reaction ◽

Physical And Mechanical Properties ◽

Isophorone Diisocyanate ◽

Visible Spectroscopy ◽

Diazo Coupling ◽

Uv Visible ◽

Diazo Coupling Reaction ◽

The Fourier Transform ◽

Azo Chromophore ◽

Azo Polyurethane

AbstractAn azo chromophore molecular S(-)-1,2-bis(4-azophenyl-4-nitro)-ethylenediamine (OABANEDA) was synthesized with 4-nitroaniline and S(-)-1,2-diphenyl ethylenediamine by diazo-coupling reaction. The azo polyurethane-urea (OAAPUU) was obtained from OABANEDA, polyether diol (NJ-210) and isophorone diisocyanate (IPDI). The structure of OAAPUU was characterized by the Fourier transform infrared and UV-visible spectroscopy. The physical and mechanical properties of OAAPUU were investigated. The refractive index (

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The role of the lifetimes of ion–neutral complexes in gas-phase electrophilic aromatic substitution

Chemical Physics Letters ◽

10.1016/s0009-2614(97)01271-2 ◽

1998 ◽

Vol 283 (5-6) ◽

pp. 307-312 ◽

Cited By ~ 2

Author(s):

Massimiliano Aschi ◽

Marina Attinà ◽

Giuseppe D'Arcangelo

Keyword(s):

Gas Phase ◽

Electrophilic Aromatic Substitution ◽

Aromatic Substitution

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Palladium-catalyzed Suzuki-Miyaura coupling of thioureas or thioamides

Nature Communications ◽

10.1038/s41467-019-13701-5 ◽

2019 ◽

Vol 10 (1) ◽

Cited By ~ 8

Author(s):

Shaoyu Mai ◽

Wendong Li ◽

Xue Li ◽

Yingwei Zhao ◽

Qiuling Song

Keyword(s):

Silver Salt ◽

Coupling Reaction ◽

Coupling Reactions ◽

Mechanistic Studies ◽

Aromatic Rings ◽

Cross Coupling Reactions ◽

Broad Array ◽

Palladium Catalyzed

AbstractCross-coupling reactions involving metal carbene intermediates play an increasingly important role in C–C bond formation. Expanding the carbene precursors to a broader range of starting materials and more diverse products is an ongoing challenge in synthetic organic chemistry. Herein, we report a Suzuki-Miyaura coupling reaction of in situ-generated Pd–carbene complexes via desulfurization of thioureas or thioamides. This strategy enables the preparation of a broad array of substituted amidinium salts and unsymmetrical diaryl ketones. The reaction is readily scalable, compatible with bromo groups on aromatic rings, tolerant to moisture and air and has a broad substrate scope. Furthermore, a single crystal structure of Pd-diaminocarbene complex is obtained and proven to be the key intermediate in both catalytic and stoichiometric reactions. Preliminary mechanistic studies demonstrate the dual role of the silver salt as a desulfurating reagent assisting the elimination of sulfur and as oxidant facilitating the PdII/Pd0/PdII catalytic cycle.

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